Author: A.A. Tanimola and B. Fawole
Publishing Date: 2015
E-ISSN: 0255-7576
Volume 33 Issue 1
ABSTRACT:
The nematicidal activity of acetone extract (AE) and water extract (WE) of leaves and roots of Aloe schweinfurthii (ASF), Aloe succrotina (AST), Aloe vera (AVR), Aloe chinensis (ACS), Aloe arborescens (AAR), Aloe keayi (AKY), Aloe macrocarpa (AMC) and Aloe schweinfurthii x Aloe vera (ASV) on egg-hatching and mortality of second-stage juveniles (J2) of Meloidogyne incognita was investigated in vitro. Extracts were tested at concentrations of 50,000 mg/kg and 25,000 mg/kg in an experiment laid out in completely randomized design in the laboratory. Data were collected on inhibition of egg-hatching, mortality of juveniles and analyzed using ANOVA (P ≤ 0.05). Both concentrations of Aloe species extracts inhibited egg-hatching and second-stage juveniles mortality was observed significantly when compared with water control. The AE of AKY leaves at 50,000 mg/kg was the most effective in egg-hatching inhibited (95.4±1.7%), followed by AVR (94 ± 0.8%) and AST (88 ± 1.4%). Water extracts of leaves of AKY, AVR and AST inhibited egg-hatching by 85.5±1.2%, 77.8 ± 0.7% and 81±1.3%, respectively. The AE of AKY, AVR, AST and WE of AKY leaves at 50,000 mg/kg were the most effective in J2 mortality with 100% recorded at 48 hr after exposure to extracts. The AE extracts of AKY, AVR, AST and WE of AKY and AVR roots at 50,000 mg/kg had 100% J2 mortality at 72 hrs. This study reveals that Aloe species have nematicidal activity and used in the management of M. incognita.
Keywords: Meloidogyne incognita, eggs, second-stage juveniles, Aloe species, acetone,
mortality.